/**
 *  Serponix is an arcade game in focus to multiplayer based on the classic game Snake.
 *  Copyright (C) 2010 - 2011  Daniel Vala
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License,
 *  or  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.

 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 *  If you have any question do not hesitate to contact author
 *  on e-mail address: danielvala42@gmail.com
 */
package com.serponix.game;

import java.awt.BorderLayout;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.SwingUtilities;
import javax.swing.text.BadLocationException;
import com.serponix.net.Informace;

/**
 * Panel of messages can display new messages at the top and scroll down earlier.
 * @author Daniel Vala
 */
public class MessagePanel extends JPanel {

    private JTextArea area;
    private String messageToSend;

    public MessagePanel() {
        setLayout(new BorderLayout());
        area = new JTextArea(5, 1);
        area.setEditable(false);
        area.setFocusable(false);
        add(new JScrollPane(area));
    }

    public String getMessageToSend() {
        String message = Informace.INFO + Informace.ODDELOVAC1;
        if (messageToSend != null) {
            message += messageToSend;
            messageToSend = null;
        } else {
            return null;
        }
        return message;
    }

    /**
     * Display given message.
     * @param message New message to display.
     */
    public void addMessage(final String message) {
        messageToSend = message;
        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                area.insert(message + "\n", 0);
                area.setCaretPosition(0);
            }
        });
    }

    public void eraseAllText() {
        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                try {
                    area.getDocument().remove(0, area.getDocument().getLength());
                } catch (BadLocationException ex) {
                    System.err.println("Chyba mazání v panelu zpráv.");
                }
            }
        });
    }
}
